Netgear R6220 Wifi performance

The Netgear R6220 has three different models under the same name. Make sure you have the same WAN MAC address on OpenWrt as the one printed on the back of the router.

If the MAC addresses doesn't match. You need to find the correct firmware. Using a wrong/incompatible firmware results in unstable 2.4 GHz wireless and poor performance in 5 GHz wireless for this model.